1 Scope
This International Standard specifies the requirements for a series of metal ball valves suitable for petroleum, petrochemical, natural gas plants, and related industrial applications.
It covers valves of the nominal sizes DN
corresponding to nominal pipe sizes NPS
and applies for pressure designations
It includes provisions for testing and inspection and for valve characteristics as follows:
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— flanged and butt-welded ends, in sizes 15 ≤ DN ≤ 500 (½ ≤ NPS ≤ 20);
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— socket welding and threaded ends, in sizes 8 ≤ DN ≤ 50 (¼ ≤ NPS ≤ 2);
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— body seat openings designated as full bore, reduced bore and double reduced bore;
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— materials.